@import "reset.css";
@import "public.css";
body {
  background: #fafafa;
}
#header {
  margin: 0 auto;
}
#header .right input{
  width: 140px;
}
#select {
  background: #f2f2f2;
}
#select .select {
  background: #f2f2f2;
  height: 60px;
  padding-left: 24px;
  line-height: 60px;
  color: #3f3f3f;
  font-size: 14px;
}
#select .select span {
  margin-right: 25px;
}
#select .select span:nth-child(5) {
  color: #777;
}
#video_btn {
  height: 582px;
  margin-bottom: 20px;
}
#video_btn div.left {
  height: 582px;
  width: 860px;
  float: left;
  padding: 20px;
  box-sizing: border-box;
  background: #fff;
  box-shadow: 5px 5px 15px 0 #ccc;
}
#video_btn div.left img {
  height: 542px;
  width: 820px;
}
#video_btn div.left1 {
  display: none;
  float: left;
  height: 580px;
  width: 860px;
  margin-right: 15px;
}
#video_btn div.left1 video {
  outline: none;
  height: 580px;
  width: 860px;
}
#video_btn div.right {
  width: 272px;
  margin-left: 48px;
  padding-top: 75px;
  float: left;
}
#video_btn div.right p:nth-child(1) {
  font-size: 22px;
  line-height: 22px;
  margin-bottom: 18px;
  font-weight: bold;
}
#video_btn div.right p:nth-child(2) {
  margin-bottom: 36px;
}
#video_btn div.right p:nth-child(2) span {
  display: block;
  font-size: 14px;
  line-height: 30px;
  color: #424242;
}
#video_btn div.right p:nth-child(3) {
  color: #424242;
  font-size: 14px;
  line-height: 30px;
  margin-bottom: 78px;
}
#video_btn div.right p:nth-child(3) span {
  display: block;
}
#video_btn div.right p:nth-child(3) span b {
  color: #ff6666;
}
#video_btn div.right p:nth-child(4) {
  height: 50px;
  width: 260px;
  line-height: 50px;
}
#video_btn div.right p:nth-child(4) span:nth-child(1) {
  color: #74c6b3;
  font-weight: bold;
  font-size: 28px;
  float: left;
}
#video_btn div.right p:nth-child(4) span:nth-child(2) {
  float: right;
  height: 46px;
  width: 128px;
  border: 2px solid #74c6b3;
  border-radius: 5px;
  text-align: center;
  line-height: 46px;
  font-size: 16px;
  color: #76c7b4;
  cursor: pointer;
}
#video_btn div.right p:nth-child(5) {
  height: 48px;
  width: 260px;
  background: #74c6b3;
  color: #fff;
  font-size: 16px;
  line-height: 48px;
  margin-top: 11px;
}
#video_btn div.right p:nth-child(5) span:nth-child(1),
#video_btn div.right p:nth-child(5) span:nth-child(3) {
  width: 129px;
  float: left;
  text-align: center;
}
#video_btn div.right p:nth-child(5) span:nth-child(1) {
  width: 130px;
}
#video_btn div.right p:nth-child(5) span:nth-child(2) {
  float: left;
  margin-top: 16px;
  background: #fff;
  width: 1px;
  height: 18px;
}
#video_btn div.right1 {
  display: none;
  height: 580px;
  width: 305px;
  float: left;
}
#video_btn div.right1 > div:nth-child(1) {
  width: 262px;
  margin: 20px 20px 8px 20px;
  border-bottom: 1px solid #e0e0e0;
}
#video_btn div.right1 > div:nth-child(1) button {
  height: 35px;
  width: 81px;
  border-radius: 4px;
  cursor: pointer;
  outline: none;
  border: none;
  font-size: 14px;
  background: #fafafa;
}
#video_btn div.right1 > div:nth-child(1) button.cur {
  background: #80c4ae;
  color: #fff;
}
#video_btn div.right1 > div.list {
  height: 517px;
  overflow: auto;
}
#video_btn div.right1 > div.list div p {
  font-weight: bold;
  line-height: 46px;
  font-size: 16px;
  padding-left: 26px;
}
#video_btn div.right1 > div.list div ul li {
  height: 40px;
  cursor: pointer;
  font-size: 14px;
  padding: 0 20px 0 26px;
}
#video_btn div.right1 > div.list div ul li span:nth-child(1) {
  float: left;
  line-height: 40px;
}
#video_btn div.right1 > div.list div ul li span:nth-child(2) {
  float: right;
  height: 18px;
  background: #80c4ae;
  width: 18px;
  border-radius: 50%;
  color: #fff;
  line-height: 18px;
  text-align: center;
  font-size: 14px;
  margin-top: 12px;
}
#video_btn div.right1 > div.list div ul li.active {
  background: #e1efeb;
  color: #80c4ae;
}
#video_btn div.right1 > div.discuss {
  display: none;
  margin: 10px 20px 0px 20px;
}
#video_btn div.right1 > div.discuss textarea {
  height: 82px;
  width: 264px;
  border: 2px solid #f0f0f0;
  box-sizing: border-box;
  border-radius: 4px;
  outline: none;
  margin-bottom: 10px;
}
#video_btn div.right1 > div.discuss button {
  height: 30px;
  width: 54px;
  background: #80c4ae;
  color: #fff;
  text-align: center;
  line-height: 30px;
  outline: none;
  border: none;
  border-radius: 4px;
  margin-left: 210px;
  cursor: pointer;
}
#video_btn div.right1 > div.discuss ul {
  margin-top: 5px;
  height: 380px;
  overflow: auto;
}
#video_btn div.right1 > div.discuss ul li {
  height: 85px;
  border-bottom: 1px solid #f0f0f0;
  padding-top: 20px;
}
#video_btn div.right1 > div.discuss ul li p:nth-child(1) {
  margin-bottom: 10px;
  font-size: 14px;
}
#video_btn div.right1 > div.discuss ul li p:nth-child(1) span:nth-child(1) {
  float: left;
  height: 36px;
  width: 36px;
  background: #d8d8d8;
  border-radius: 50%;
  margin-right: 10px;
}
#video_btn div.right1 > div.discuss ul li p:nth-child(1) span:nth-child(2) {
  float: left;
  margin-top: 10px;
}
#video_btn div.right1 > div.discuss ul li p:nth-child(1) span:nth-child(3) {
  float: right;
  margin-top: 10px;
}
#video_btn div.right1 > div.discuss ul li p:nth-child(2) {
  font-size: 14px;
}
#teacher {
  height: 156px;
  box-shadow: 5px 5px 15px 0 #ccc;
  background: #fff;
  padding: 24px 0 0 22px;
  box-sizing: border-box;
  margin-bottom: 20px;
}
#teacher h3 {
  font-size: 20px;
  line-height: 20px;
  margin-bottom: 26px;
}
#teacher div {
  padding: 8px;
}
#teacher div img {
  float: left;
  height: 62px;
  width: 62px;
  border-radius: 50%;
  background: #d8d8d8;
  margin-right: 20px;
}
#teacher div > span {
  float: left;
}
#teacher div > span:nth-child(3) {
  height: 50px;
  width: 1px;
  background: #80c4ae;
  margin: 8px 34px 0 30px;
}
#teacher div p {
  float: left;
  height: 62px;
  padding-top: 6px;
}
#teacher div p:nth-child(2) span {
  display: block;
}
#teacher div p:nth-child(2) span:nth-child(1) {
  font-size: 18px;
  line-height: 18px;
  margin-bottom: 14px;
  font-weight: bold;
}
#teacher div p:nth-child(2) span:nth-child(2) {
  font-size: 16px;
}
#teacher div p:nth-child(4) {
  width: 838px;
  float: left;
  font-size: 16px;
  line-height: 18px;
  color: #4f4f4f;
}
#catalog {
  background: #fff;
  padding-bottom: 4px;
  margin-bottom: 50px;
}
#catalog > p {
  height: 66px;
  background: #fff;
  box-shadow: 5px 5px 15px 0 #ccc;
  text-align: center;
  margin-bottom: 14px;
}
#catalog > p button {
  outline: none;
  height: 66px;
  width: 80px;
  display: inline-block;
  background: #fff;
  text-align: center;
  font-size: 14px;
  line-height: 66px;
  border: none;
  cursor: pointer;
}
#catalog > p button.cur {
  background: #80c4ae;
  color: #fff;
}
#catalog .catlog div {
  padding: 0 40px 0;
}
#catalog .catlog div > p {
  font-weight: bold;
  font-size: 16px;
  color: #3b3b3b;
  line-height: 52px;
  cursor: pointer;
}
#catalog .catlog div > p b {
  float: left;
}
#catalog .catlog div > p b:nth-child(2) {
  float: right;
}
#catalog .catlog div ul {
  display: block;
}
#catalog .catlog div ul li {
  height: 40px;
  line-height: 40px;
  cursor: pointer;
}
#catalog .catlog div ul li:hover {
  background: #e5f3ef;
}
#catalog .catlog div ul li:hover span:nth-child(4) {
  display: block;
}
#catalog .catlog div ul li:hover span:nth-child(3) {
  display: none;
}
#catalog .catlog div ul li span {
  float: left;
  font-size: 14px;
}
#catalog .catlog div ul li span:nth-child(1) {
  margin-top: 9px;
  height: 22px;
  width: 22px;
  background: #80c4ae;
  font-size: 12px;
  line-height: 22px;
  text-align: center;
  border-radius: 50%;
  color: #fff;
  margin-right: 16px;
}
#catalog .catlog div ul li span:nth-child(3) {
  float: right;
}
#catalog .catlog div ul li span:nth-child(4) {
  display: none;
  margin-top: 4px;
  line-height: 28px;
  text-align: center;
  float: right;
  height: 28px;
  width: 98px;
  border: 2px solid #80c4ae;
  background: #e5f3ef;
  color: #80c4ae;
  margin-right: 20px;
}
#catalog .detail {
  display: none;
}
#catalog .detail > img {
  width: 1180px;
}
#detail {
  display: none;
}
#btn {
  text-align: center;
  color: #74c6b3;
  text-decoration: underline;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  margin-bottom: 80px;
}
